to_slow

iTrader: (3)

OK I have a straight pipe On my fd and I get boost spikes like 17 ps .. Can I control them with the power fc or get like a normal boost controller ? Thanks

Johnny

no...

probably need a boost controller..not to mention porting your wastegate...

try a search on this subject..you may find you can try changing pill size and such, but I dont think that will work..

VTAOE

I put a downpipe and a catback on my car and was getting similar boost spikes. I think that you should be able to control it by using pills. Even though I don't have a straightpipe I think the principle is the same. You can find more info about changing the pills at this website.

http://www.scuderiaciriani.com/rx7/how-to_turbos.html

I would suggest that you buy the Holley Carb (which contains several different size jets) and get several feet of fuel line hose (I think that is the correct type). What you might want to do is take the hoses off with the pills (wrap tape around them and label them so you know which one goes where) and then replace them with hoses without any pills at all. If you are still getting boost spikes, then changing the pills won't do you any good. You should be getting around 8 psi or so without any pills. If that is around what you get then proceed with adjusting the pills.

When I adjusted my pills I started at a high numbered holley jet (around 84) and then jumped down around 5 jet sizes so that I could pinpoint the correct pill size faster. I would also recommend that you keep the size difference which was set by the factory. By this I mean that the Wastegate (shorter hose) should be 5 sizes larger than the Precontrol (longer hose). I think the stock orifice sizes are as follows:

Pre-control (longer hose) .059"
Wastegate (shorter hose) .064"

These roughly correspond to pill 64 and 59 from Holley. See the website I listed above for more info. I hope I helped at least a little bit.

to_slow

iTrader: (3)

Thanks VTAOE! Eny one else that can help me out ?

ttpowerd

all I have to say is be careful...if you go over 14.7psi you are in real danger of blowing your motor......
and do a search

RecKleSs

The boost controller will not control your boost creep/spike. The PFC worked for me for a little while, but now I have some boost creep. I have hit 17 psi and I'm still surprised that my engine is running extremely strong. The best thing to do is get the wastegate ported, upgrade your ECU and upgrade your fuel system. Also, do a search on the forum, this has been discussed many times, good luck.

to_slow

iTrader: (3)

Thanks people ..

VTAOE

Have you figured out the problem yet? Did changing the pills help or have you had a chance to try them? Just checking on your progress. It took me a little over a month to figure out the problem with my boost (I had to adjust the pills, replace a solenoid and a check valve. Let me know how things are coming along. Maybe I can help.

to_slow

iTrader: (3)

Well no I did not try the pill way . Because there is no shop around me that know what there doing ! What I mean its all about Honda in my area . So its kind a cold out side 4 me to work on it . . I was hoping that I can get the pfc just to hold my motor from not blowing up till I get a chance to do the pill job .

Swamp RX-7

Do the home depot boost controller. Works great for me, plus it's inexpensive.

funnyguy_11

You may also be getting the higher boost spikes because of the cold weather. I've noticed on the few warmer days we had this winter, my spikes weren't as bad. I may try the Home depot solution as soon as I get some good silicon tubing.

justin

profec B cured my spiking.
Each car is a little different

to_slow

iTrader: (3)

.Monday is the day I get the pfc I hope it does the job ! will keep you posted if I do get the problem fixt .

rynberg

A PFC will likely not fix the problem if you are seriously spiking over 15 psi. The stock fuel pump and injectors cannot supply enough fuel for that much boost. You are seriously risking running very lean on the spikes. This is one of the cons of installing a midpipe. A boost controller (or Home Depot method) may not help enough either because your wastegate is simply getting overwhelmed and can't vent enough air. If your attempts to reduce the spike don't work, you should seriously consider going with a high-flow cat instead of a midpipe.

Ef-Dee

ummm...what's a boost spike???

rerx7

I have the same problem but it is not as high. I am thinking of setting up my AVC-R too see if it helps to lower the boost spike. It went to abit over 15 then back. I noticed this when I was running on dyno, and here is my chart I don't know why it is not a smooth cruve, can anyone help me out?

Dyno sheet

rynberg

Wow, that is a BIG *** boost spike at the transition.

rynberg

Damn, I just noticed that you're running an intake, downpipe, midpipe, and exhaust and you don't have an ecu! You need an ecu now. That HKS fuel stuff is not enough. You should also upgrade your intercooler and fuel pump.

With those mods you should be making more than 275 rwhp.

Ef-Dee

will somebody please tell me what a boost spike is??????!!!

skunks

make a restrictor plate, i did and it helped me come down from 1.5 bar to 0.9 bar

RecKleSs

It is basically having too much boost that is desired. For example, if I set my boost controller to 11.5 psi and I end up getting more than 11.5 psi this will be known as boost creep or boost spike. Boost creep and boost spike is a little different to one another, however, both are basically having too much boost that is not or difficult to controll.

Ef-Dee

how do you tell that you have a boost spike then?

rynberg

A boost spike is just that, a momentary large peak in boost. It will occur at your transition to both turbos (approx 4500 rpm). Boost creep is when your exhaust and intake is open enough that your wastegate no longer vents enough air to remain at a lower boost level.

to_slow

iTrader: (3)

Do you think the new blitz boost controler will help a bit? well thanks again ..!

RecKleSs

HELL NO

I was hoping the blitz boost controller will help me a little bit with the boost creep, however, there was no change at all in boost creep.